For me, the big problem with this kind of musical/theatrical production is that you're doing one thing — provoking excited emotions and feelings in a group context, just as would happen at a well-produced secular concert, or a moving, personal comedy show — and implicitly or explicitly claiming that it is a personal religious experience. Many times with young people who don't know the difference.

I suppose it might be fair to include music-induced group ecstatic experiences in your definition of “religious”. But I find the mix-n-match, the implied claim that the emotion of the large-context experience is actually a result of some kind of personal, relational connection to God, to be a heavily loaded and ambiguous possible untruth.

ymmv — I definitely have religion issues :-)